PDF malware analysis — malicious · a573a5da35771e81

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 02:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 6d1bd4b7dd7bc24ac529a3c6c6a8afde SHA-1: 109fdd2cba53b3e890021279cda79cdcacea8b06 SHA-256: a573a5da35771e81c30d148bc392a98719b7081e01dd19ef0a933281cbedc7d1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URLs indicate it's likely used for phishing or distributing further malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://philabc.ru/uplcv?utm_term=numeros+cuanticos+de+todos+los+elementos+pdf PDF link annotation
- http://langeline.com/ckeditor/upload/files/64918488690.pdfIn PDF document text
- https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/febde7628a446795b1ef1fc5cff4fd06/goziwuvevux.pdfIn PDF document text
- http://www.ags-sib.ru/ckfinder/userfiles/files/35066758790.pdfIn PDF document text
- http://belean.pl/userfiles/file/puzirotoxelen.pdfIn PDF document text
- https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/talutuliresav.pdfIn PDF document text
- http://dakmoto.cz/obrazky/file/85397889067.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/db35091951629bfa3f61a395cafc6c76/93783467845.pdfIn PDF document text
- http://oreade-breche.fr/userfiles/file/67851444519.pdfIn PDF document text
- https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/e2e5b56a4b32df58174dbad6e6231733/29728631055.pdfIn PDF document text
- http://blissrenewbeauty.com/newerac2c/userfiles/file/lujaresimategelozefaz.pdfIn PDF document text
- http://guowangcable.com/d/files/75378093442.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6f7e3180ab6ea1199f12413f6792823b/18552725569.pdfIn PDF document text
- http://bjyhyy.cn/filespath/files/20210817193437.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a734edc38c1b788a72352c5176e33c35/3650247416.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078629f2ee92---moruzezal.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f54fd4f2e8b---toxalemifizaza.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cf83f972fe178e6eab300cca485f22f4/20095230336.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f49dc8143---jixorogipeditexumoja.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/88196acc5173a56ba97e8a5207e09bf1/5335157572.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612582fb81150---vavufudogubemama.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609420aee8795---3710351723.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/10857b05a165a8ad727f7f70d92df39f/88100656716.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e56997cf---33761697157.pdfIn PDF document text
- https://khonggiansangtao.com/platformecom/img/upload/file/88644505261.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/c0ukh19r4vdc1kr7gvu2rl4hlc/5584583216.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/3be347ef2cd6c9047af310eb5acee338/dapowosiz.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d746.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD746	10860 bytes
SHA-256: `a1a77c28138119a78c1ec76c2eef229e23265109f9915e741bc2fe8d8f81433e`
`font_01_sfnt_off0000f054.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF054	17496 bytes
SHA-256: `e3037928d018a7a41570575fcfe4c362ca4fe443d560c8944e21247c986daf5d`
`font_02_sfnt_off00011c9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C9E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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